The Red Cross is taking donations for Katrina Relief on their web site.
If you receive an e-mail from anyone soliciting funds for Katrina relief, delete the e-mail immediately. It will be spam mail sent by a rip-off artist. Any funds you send in response to an e-mail message will never reach hurricane victims. The Red Cross and other legitimate relief agencies do not solicit by e-mail.
Even if the e-mail claims to be from the Red Cross, you will know that it is bogus.
The only legitimate place to donate via the Red Cross is at http://www.redcross.org. Accept no substitutes.
The "Donate Now" link on that site may be overloaded, so you may need to try again later.